from machine import Pin
from neopixel import NeoPixel
pin = Pin(23, Pin.OUT)   
np = NeoPixel(pin, 30)   # 30为灯带的颗数
np[0] = (0, 255, 255) # set the first pixel to white
np.write()

np.fill( (255, 255, 255) )#填充所有
